Abstract
The advanced energyand resource saving technologies of food production wastewater treatment include anaerobic and aerobic steps. At present, various methods of intensification and optimization are used to increase the efficiency of anaerobic processes of wastewater treatment, including selection of active microbial communities, providing the optimum temperature regime, immobilizing biomass by granulation or biofilm formation, reducing various inhibitory effects, phase separation or pre-acidification, chemical or biological pretreatment of wastewater. The aim of this investigation was researching the effect of hydraulic and organic load rates on the energy efficiency of the wastewater treatment process and evaluating the energy efficiency depending on process conditions. Experimental laboratory installation included subsequently connected bioreactors, one from which acted as first stage and other bioreactors as the second stages of anaerobic process. It was shown that the biogas formation at the first and second stages differs significantly. A small volume of released biogas on the first stage allows us to ignore it, but characteristics of biogas formation at the second stage bioreactors are close and are described by general functional dependence. The specific yield of biogas from the organic matter consumed Ybg is independent of the specific organic load rate L, but is dependent on the specific flow rate of the treated water D.
Highlights
Various methods of intensification and optimization are used to increase the efficiency of anaerobic processes of liquid waste and wastewater treatment
Bioreactor B1 acted as the first stage of anaerobic treatment, B2-B4 - bioreactors of the second stage of anaerobic methanogenic process
The specific biogas yield of organic matter consumed Ybg is independent of the specific organic load rate L, but substantially dependent on the specific flow rate D
Summary
Various methods of intensification and optimization are used to increase the efficiency of anaerobic processes of liquid waste and wastewater treatment. In order to obtain the desired effect it is necessary to provide correct stages volumes ratio due to the difference in the growth rates of the anaerobic bacteria groups. Solving this issue requires preliminary laboratory modeling of the treatment process followed by it mathematical optimization. The possibility of optimizing the process of combined anaerobic-aerobic treatment of wastewater of the milk processing plant using the treatment efficiency criterion was shown [11]. Another possible optimization criterion is the energy efficiency of the process
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